OSHA Issues Standard Interpretation on 'Sludge Exempt' RegulationsFebruary 29, 2008If sludge has a characteristic of hazardous waste but is not a solid waste when reclaimed, is it not hazardous waste, after all? Which OSHA standards apply to workers handling such material, and what are the associated employer obligations for employee hazard communication? Finally, if it's true that under EPA's Federal Sludge Exemption the material is not hazardous waste, is the sludge exempt from OSHA's HazCom and HAZWOPER standards? I